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Acquisitions and divestments - Opening Balance sheet as of acquisition date (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Jan. 31, 2019
Dec. 31, 2018
Jul. 09, 2018
Acquisitions and divestments - Text Details (Detail) [Line Items]        
Goodwill € 8,654   € 8,503  
Contingent liabilities recognised as of acquisition date 11   € 361  
EPDSolutionsLtd[Member]        
Acquisitions and divestments - Text Details (Detail) [Line Items]        
Goodwill 271 € 271    
Identifiable intangible assets recognised as of acquisition date 227      
Cash and cash equivalents recognised as of acquisition date 2     € 2
Trade and other payables recognised as of acquisition date 2      
Deferred tax liabilities recognised as of acquisition date 3      
Contingent liabilities recognised as of acquisition date 245     € 239
Assets (liabilities), total 250      
Financed by equity € 250